(1)No enforcement notice shall be issued under section 172 in respect of development carried out by or on behalf of the Crown after 1st July 1948 on land which was Crown land at the time when the development was carried out.
(2)The following provisions of this section apply to development of Crown land carried out otherwise than by or on behalf of the Crown at a time when no person is entitled to occupy it by virtue of a private interest.
(3)Where—
(a)it appears to a local planning authority that development to which this subsection applies has taken place in their area, and
(b)they consider it expedient to do so having regard to the provisions of the development plan and to any other material considerations,
they may issue a notice under this section (a “special enforcement notice”).
(4)No special enforcement notice shall be issued except with the consent of the appropriate authority.
(5)A special enforcement notice shall specify—
(a)the matters alleged to constitute development to which this section applies; and
(b)the steps which the authority issuing the notice require to be taken for restoring the land to its condition before the development took place or for discontinuing any use of the land which has been instituted by the development.
(6)A special enforcement notice shall also specify—
(a)the date on which it is to take effect (“the specified date”), and
(b)the period within which any such steps as are mentioned in subsection (5)(b) are to be taken.
(7)A special enforcement notice may specify different periods for the taking of different steps.